Keith Mitchell has since 2008 been Director of Engineering at the Internet Systems Consortium, where he has responsibility for ISC's open-source software and network development. This includes operation of ISC's F-root, DNS and public benefit hosting network infrastructure. Prior to this at ISC he managed the OARC programme for DNS operators, and remains President of the newly autonomous nonprofit OARC Inc.

Before moving to the US, Keith conceived the UK Network Operators' Forum UKNOF in 2005, and has been chairing this for its past fifteen successful meetings. He has previously been involved in Internet engineering and governance for some 20 years, founding the London Internet Exchange (LINX) in 1994 where he was Executive Chairman until starting up XchangePoint in 2000. He has served as a non-executive Director of Nominet UK, Chairman of the RIPE NCC Executive Board and founded the UK's first commercial Internet provider, PIPEX in 1992.